Although not appearing as such in the known written records of Arda during the Second and Third Ages, Gandalf mentioned the werewolves as being among Sauron's servants in the late Third Age, along with orcs, trolls, wargs, and wraiths.[2]

Portrayal in adaptations

Classified as Undead Beings, the Werewolves are either bred from Wolves or Wargs. They cannot transform themselves into Men, although they can alter shape into being able to stand upright (while remaining Wolf-like).[6]